001: /* ===========================================================
002: * JFreeChart : a free chart library for the Java(tm) platform
003: * ===========================================================
004: *
005: * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
006: *
007: * Project Info: http://www.jfree.org/jfreechart/index.html
008: *
009: * This library is free software; you can redistribute it and/or modify it
010: * under the terms of the GNU Lesser General Public License as published by
011: * the Free Software Foundation; either version 2.1 of the License, or
012: * (at your option) any later version.
013: *
014: * This library is distributed in the hope that it will be useful, but
015: * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
016: * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
017: * License for more details.
018: *
019: * You should have received a copy of the GNU Lesser General Public
020: * License along with this library; if not, write to the Free Software
021: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
022: * USA.
023: *
024: * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
025: * in the United States and other countries.]
026: *
027: * ------------------------------
028: * AbstractIntervalXYDataset.java
029: * ------------------------------
030: * (C) Copyright 2004-2005, by Object Refinery Limited.
031: *
032: * Original Author: David Gilbert (for Object Refinery Limited).
033: * Contributor(s): -;
034: *
035: * $Id: AbstractIntervalXYDataset.java,v 1.3.2.1 2005/10/25 21:36:51 mungady Exp $
036: *
037: * Changes
038: * -------
039: * 05-May-2004 : Version 1 (DG);
040: * 15-Jul-2004 : Switched getStartX() and getStartXValue() methods and
041: * others (DG);
042: * 18-Aug-2004 : Moved from org.jfree.data --> org.jfree.data.xy (DG);
043: *
044: */
045:
046: package org.jfree.data.xy;
047:
048: /**
049: * An base class that you can use to create new implementations of the
050: * {@link IntervalXYDataset} interface.
051: */
052: public abstract class AbstractIntervalXYDataset extends
053: AbstractXYDataset implements IntervalXYDataset {
054:
055: /**
056: * Returns the start x-value (as a double primitive) for an item within a
057: * series.
058: *
059: * @param series the series index (zero-based).
060: * @param item the item index (zero-based).
061: *
062: * @return The value.
063: */
064: public double getStartXValue(int series, int item) {
065: double result = Double.NaN;
066: Number x = getStartX(series, item);
067: if (x != null) {
068: result = x.doubleValue();
069: }
070: return result;
071: }
072:
073: /**
074: * Returns the end x-value (as a double primitive) for an item within a
075: * series.
076: *
077: * @param series the series index (zero-based).
078: * @param item the item index (zero-based).
079: *
080: * @return The value.
081: */
082: public double getEndXValue(int series, int item) {
083: double result = Double.NaN;
084: Number x = getEndX(series, item);
085: if (x != null) {
086: result = x.doubleValue();
087: }
088: return result;
089: }
090:
091: /**
092: * Returns the start y-value (as a double primitive) for an item within a
093: * series.
094: *
095: * @param series the series index (zero-based).
096: * @param item the item index (zero-based).
097: *
098: * @return The value.
099: */
100: public double getStartYValue(int series, int item) {
101: double result = Double.NaN;
102: Number y = getStartY(series, item);
103: if (y != null) {
104: result = y.doubleValue();
105: }
106: return result;
107: }
108:
109: /**
110: * Returns the end y-value (as a double primitive) for an item within a
111: * series.
112: *
113: * @param series the series (zero-based index).
114: * @param item the item (zero-based index).
115: *
116: * @return The value.
117: */
118: public double getEndYValue(int series, int item) {
119: double result = Double.NaN;
120: Number y = getEndY(series, item);
121: if (y != null) {
122: result = y.doubleValue();
123: }
124: return result;
125: }
126:
127: }
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